Castor (SR 2339) is a high-population ring of many small worldlets (planetoids AKA an "asteroid belt"), not capable of retaining an atmosphere or water, and are both non-agricultural and industrial in nature with a billion or more sophonts in population size.

These worldlets warrant hazardous environment precautions.

Life in a vacuum requires great discipline. After all, it only takes one forgotten seal on a vacuum suit to spell death. Those who survive tend to be very methodically-minded and attentive to small detail.

As a group of industrial worldlets, well-developed manufacturing and processing sectors are major business here. Manufactured goods are a major export item.

The worldlets are, for the most part, unable to produce quality foodstuffs and must import them.

This a "high technology" world with technology achievements at, near, or over technology standards for Charted Space.